Process of and apparatus for cooking fibrous materials



June 5, 1923. 1,457,326 J. D. TOMPKINS PROCESS OF AND APPARATUS FOR COOKING FIBROUS MATERIALfi Filed April 12 l919 2 Sheets-Sheet 1 June 5 1923' J. D. TOMPKINS PROCESS OF AND APPARATUS F611 COOKING FIBROUS MATERIAL5 Filed April 12 1919 2 Sheets-Sheet 2 ORNEY digester. Water heing supplied to the eas- 11);,1'. the rotor In uu'ans ol' arms or \eins l5) more: the water to trarei around the inner periphery ol' the easing, and the lnitvt' litiilgi elliptiral, the water il'lt'tlt'S l'roin the rotor as tho arms are pinning 'HlI the eutranre ports .52 and l t. thnrausingr a sui-tion or partial \ai-ninn tween the arms and perhinting the gases l roln the digester to ilow in helw rn the said arms. nl'ter \\'lllt'li tho l VPHli'lPiK V ol' tln easing mum-s the \\';itt't to approarh the rotor and to expel thag: s l)ll\\ !l s-i d arin-i through delirvry Eitll'iri L5 and no. 'lhe rotor is shown a i driven a motor 2? The pump easing is prmided with means to draw oil the euros of water due to tlu ronrentration of steam In the plrmJlll' iu tnnrel haw howu a pipe 28 lead ing from the lower portion of the easing whirh pipe is prm ided with :i \zilre 2!). The pipe 30 is ronuerted lw a pipe Zil with a pro forateil pipe iii in the liottoin ol tho iii-- gestei a \"nlre iifv i eilig provided to rontrol passage ul stO-nm to the peiu'orated pipe.

in order to prorent the lihres trout elon- {iii in the pipe R and from living drawn oti th relhrough and reaehing [hr pump, the entrain-o of tho said pipe is -'u:ir led as h a sieve 2H. I also desire to riri'nlate only tho gases 'l'roin the digester and do not wish to draw the liquor np through. tho said pipe in, the usual \va yzis the liquor would Parry with it the lihre and tend soon to t'ltllltt the said srreen. For this latter purgosr I prorido an overflow pipe also guarded by a srreen not shown at the highest lt\'ti to whirh it is safe to have the liquids rise and sueh pipe is eontrolled h a valve :56,

in the operation of the ilesrrihml apparatus arcording to In) said process. the digester is lirst tilled with (-hips and eooltinp liquor to a proper extent. sleain is admitted through either or l)()tll ol' the pipes 4tand lit) to the bottom of the (lig'ester and ttliOWUtl to esrape through tho top hy the pipes Sand It with valves l5, l6 and iiB'wide open and valve. 16 partially upon and, the pump having hoen started, this action is continued until the temperature has risen to a point suitable for cooking. when tho valve. (3 is (.iUSUtl. Valvo 36 is kept elosed until neenssary to open to prevent liquor from rising to the top I'tliCfStlLUll.tllHl the rilres 15, it} and 233 are opened to the proper extent, The pump thun draws in the gases ll'Oflt the digester and the steam from the boiler, the two intermingling in the pipe lit so that tho steam reheats the gases. The gases and water of eondenszition pass through the pump, tho water of rondensation heing left in thr (as inn exi'ept as it may he allowed to eseape through the pipe "thus the steam and water ol roinlensation are lwpt intermingled with the gases lroin the digester until the lattni have l een l'ori'ed heyond the pnnipt and the tulirst o riportnnity is afforded for the trzinsl'or of heat from themstenin and water of eoiulensaition to the gases. Tin water of eondensution washing the part of the rotor and easing. tends to protert them from the l'til'tUH'iYt aetion ol' the reagents in the gases. i ll! gases are nontinuousl t' forced down the pipe lit and through the pipe lit to the pet l'orated pipr- Iii? whenee the) esrape upward through the mntinuons de ester. the rising strnani oi linlihle tending to keep the lihre in a stat ol' suspension in the digestc-r throug hont the untire rooltiup; proeess and thus wintinnonsly insuring an even temperature and eren exposure to the reagents in the gases and liquor and tending to bring about an in en uniting oi all the lihrrs. As only the gases and vapors troni the digester riso through the sereen it}, the teudonry ot' the said hrlern to clog is reduced to a minimum. This is Very desiral-le. sinee whenever the sen-en is (dogged it is necessary to admit strain l'roni the holler harltwnrd from tinpipe It to rlenr the rrven and this interruption of the suspending aetion ot' the hulihles ol gas iinniniliati'ly gives the lihrrs a rhanw to :i'ttlito the luittoni of tho digester. a ttlit iiition rarely it' U-'ii'ttl from :i'nl to root; ion-nail). This aioiilanro ot the rise of the ll pie'ii' to the sereen is doe to the orer inw at i'orded through tho pipe 35.

he constant and uniform circulation of the gases roinhined with the reheatin g of then: not oniv maintains uniform eonditions and temperatlue throughout the cool; but makes it possihhto pass th gases through the digester a and again wihont interrnptioin giving the utmost opportunity to utilize their reagents to the l'uliest possible extent and to dissolve in the condense water and trap awai soluble reagents whieh are liberated from the wood tihro in cooking it and whirh are not henelieial to have in the gasvs as they are returned for repeated use in eooltin This fuller utilization of the rheniieals in the gas of the digester also perlnits liquors to he used which are of a lower degree of eheniical activity (acidity in tho ease of the sulphite process and alkalinity in the sulphate or soda. process) and so the danger ot the btUt'li settling, eharring, or otherwise over-treating the, fibres is not only avoided hut unil'ornily perfect cooks and stronger tihres are insured.

While the steam is used directly in re heating the Jasost the water of'condensation does not dilute the liquor in the digestcr heranse it is separated from the gas in thepulnp and trapped out. Any liquor or spray whieh might he in the g s from tho top of the digester is also separated from the gases hr the eentril'ugal zu'tion ot' the pump an trapped away.

l i'laim: l, The proress ul rushing tihrons iua orial consisting in \vitlulrawing gases from the top of the digestcr and re-introducing them into the bottom thcreot' by means of a pump, introducing slcaiu into the gases before they reach the pump and using the water of cond nsation a a compressing member for the gases in thc pump.

2. The process ol cooking fibrous material comprising pumping gases out of the top of the digester and into the bottom thereof. introducing steam into said gases before they l'l'ztcli the pump and permitting the water of condensation to pass with the gases into the pump.

3. The process of cooking fibrous material comprising pumping gases out of the top of the digester and' into the bottom thereof, introducing steam into said gases before they reach the pump, permitting the water oi condensation to pass with the gases into the pump, and witlnlrawing the water of condensation from the pump separately from said gases.

4:. The process of cooking fibrous material comprising pumping gases out of the top of a digester and into the bottom thereof, introdi'lcing steam into said gases he tore they reach the pump and withdrawing the water of condensation from said gases after they have entered the pump.

5. The process of cooking fibrous material comprising pumping gases out of the top of a digester and into the bottom thereof, introdiuring steam into said gases and washing portions of said pump that are exposed to said gases with the water of condensation.

6. The process of cooking fibrous material comprising pumping gases out of the top of a digcster and into the bottom thereof, and pcrmittitng the liquors in the digester to escape at a level sutlicicntly below the top of the digester to prevent their entering the suction of the pump.

7. The process of cooking fibrous material consisting in removing gases from the top of the digester and ire-introducing them into the bottom thereof and in the meantime drying said gases by centrifugal action.

In an apparatus for cooking fibrous ma tcrial, the combination of a digcster, a pump, piping so connecting the top of the digester with the suction of the pump that substantially all the water of condensation will pass into said pump, means for introducing steam into said piping. and connections between the delivery of the pinup and the bottom of the digestcr.

9. In an apparatus for cooking fibrous materialfthe combination of a dig-ester. a

pump. pipin; connected with the top of the digcstcrwith the suction of the pump. means for introducing team into said piping. connections between the delivery of the pump and the bottom of the digester. and an ovcrflow for the liquor of the digester at a level below the exit at the top of said digester.

to. In an apparatus for cooking fibrous material. the comliination oi' a digcstcr. a pump; connections between the top of said tligester and the suction of said pump. connections between the delivery of said pump and the bottom of said digester. and an overflow in said digester at a level below the exit from the top of the digester.

11. In an apparatus for cooking fibrous material, the combination ol :1 digester, a pinup having a water compression member. a connection between the top of said digester and the suction of said pinup, and a connection between the delivery of said pump and the bottom of said digcster.

12. In an apparatus for cooking fibrous material. the combination of a digestcr, a pump having a water compression member, a connection between the top of said digester and the suction of said pump, a connection between the delivery of said pump and the bottom of said digester. and,

means for introducing steam into the circuit thus formed.

13. In an HIDIHU'HUIS for cooking fibrous material. the combination of a digcster, a pump having a water compression member, a connection between the top of said digester and the suction of said pump, a connection between the delivery of said pump and the bottom of said digester, and means for introducing steam into the circuit thus fori'ned at a point in advance of the pump.

14. In an apparatus l'or cooking fibrou material, the combination of a digcster. a ll \'tll tllI'lllI1t' pump. a connection between the suction of said pump and the top of the digestcr. and a connection between the delivery of said pump and the bottom of the digcstcr.

l5. In an apparatus for cooking fibrous material, the combination of' a digestcr. a hydro-turbine pump, a connection between the suction of said pump and the top of the digester, a connection between thode livery of' said pump and the bottom of the diggyester, and means for introducing steam into the circuit thus formed in advance of the pump.

16. In an apparatus for cooking fibrous material. the combination of a digester. a hpdro-tnrbinc pump. a connection between the suction of said pump and the top of the digcsten a connection between the delivery of said pump and the bottom olthe digcster. means For introducing steam into th cir cuit thus formed in advance of the nunp. and an overflow for the liquor of l to di gestcr at a point below the exit from the top of the digester.

IT. in an apparatus for cooking fibrous loU llt)

mnu-rinL 1w mmbinatinn of a digcster, :1- a point bclr nv the exit from the top of [he 1|)Jl'n-iill'hih0 pump, a tonnec-tion between digebtm', and means for \vithdrznving the 10 Uusm-lnm of said pump and the top of the water of mmdvnsniiun Hum lhu wlmmm-r of (liggwtvl'. n (mun-"(ion lwhvven the delivery said pump.

ut' mid pump um] tho bottom of thv digwh-r. In testimony that I claim the i'ul'vgming. mmms fininh-odm-hzg stvnm into the (ir- T hm'v hol'unutn sv! my hum] this 15th NIH lhus 11mm! in udvzmvo of the pump. 01' Mal-ML 1915).

:m m'cl'flnw for 11w liquor of the dig-05KB! nt JOHN T). TUBiPKIBTn Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,457,326, ranted June 5. 1923. upnn th application of John D. Tompkins, nf Vnlatie, New York, for an improvement in Processes of and Apparatus for Cnnkmg Fihl'ulls inU-Tiillfi. errors appear in the printed specification requiring mnwtinn as follmm: Page 2. line 75. strike out. the word continuous and insm'! Lhz- 52mm tn fnllnw H10 "rm-I th second occurrenve, same line; mgv 3. Iinv 119, vlaim 16.1'01' (he misspelled cumpound word hpdro-turbinc road hydm-lwhinex and that. Hm said Loftors I atent should be read with these correcfions thm'vin 111:1 Hm same may (:nnform to the record of the case in the Patent Office. I

Signed and scaled this 17th day of July, A. 1)., 1923.

[am] WM. A. KINNAN,

' Acting Commissimer of Pat at: 

